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Which version of the EF 50mm?
When using these lenses for astro imaging, focus is CRITICAL, else they will exhibit C.A.
For terrestrial imaging its not as obvious.
Only a very few high end Canon EF lenses will not show C.A for astro, like the EF 300mm f/2.8.
The nifty fifty, the 50mm f/1.4 and the 50mm f/1.2, the 85mm f/1.2 and others. will show C.A around stars and as I said, perfect focus will minimise C.A but won't eliminate it.
Astro imaging is very demanding on these lenses and where they may be suitable for terrestrial not showing obvious C.A, for astro the pin point source of light does separate the men from the boys and will show and highlight the C.A in even the higher end lenses.
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